Chemical Coprecipitation-Thermal Synthesis of Nano-Ni-Co Alloy for Efficient Hydrogen and Oxygen Evolution Reactions

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL Electrocatalysis Pub Date : 2024-10-22 DOI:10.1007/s12678-024-00902-w

Yuanjun Sun, Zelin Li, Fei Zhu, Fei Yin, Songwei Ge, Fairy Fan Yang, Lili Gao, Guoju Chen, Fan Yang, Ping Hu

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Abstract

Transition metals from the d-group, specifically Fe, Co, and Ni, have demonstrated exceptional electrocatalytic performance as non-noble metal electrocatalysts for water splitting in alkaline electrolytes. In this study, nanostructured Ni-Co alloy electrocatalysts were synthesized using a chemical coprecipitation-thermal method and tested in a 1 M KOH alkaline solution. Five distinct nano-Ni-Co alloy electrodes, each with unique morphologies and structures, were fabricated by varying the composition. The nano-Ni-Co alloy facilitates the adsorption and desorption of H⁺ and OH⁻ ions, thereby enhancing the efficiency of hydrogen and oxygen evolution reactions (HER and OER). Among the tested alloys, the NiCo1 alloy exhibited outstanding electrocatalytic activity in alkaline media, with overpotentials of 267.6 mV for HER and 158.5 mV for OER at 40 mA cm⁻². This work demonstrates a simple and effective synthetic route for integral water decomposition, highlighting the potential of Ni-Co alloys for practical applications in the energy sector.

Graphical Abstract

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化学共沉淀-热合成纳米ni - co合金的高效析氢和析氧反应

d族过渡金属，特别是Fe、Co和Ni，作为非贵金属电催化剂，在碱性电解质中表现出特殊的电催化性能。本研究采用化学共沉淀法-热法合成了纳米镍钴合金电催化剂，并在1 M KOH碱性溶液中进行了测试。通过改变纳米镍钴合金的组成，制备了五种不同的纳米镍钴合金电极，每一种电极都具有独特的形貌和结构。纳米镍钴合金有利于H+和OH−离子的吸附和解吸，从而提高了析氢和析氧反应（HER和OER）的效率。在所测试的合金中，NiCo1合金在碱性介质中表现出出色的电催化活性，在40 mA cm−2下，HER和OER的过电位分别为267.6 mV和158.5 mV。这项工作展示了一种简单有效的整体水分解合成路线，突出了Ni-Co合金在能源领域实际应用的潜力。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

期刊介绍： Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.